Fig. 5

a Reflectance values for mixtures of reconstruction paint cochineal, as measured and as calculated with the model. Notation similar to Fig. 4; percentages refer to mixtures described in Fig. 3. b Optimized K (blue lines) and S values (red lines) for cochineal (solid lines), compared to values published by Takei and Yoshida (dashed lines) [61]. Optimized S values for cochineal are effectively zero